Reviewers: mvstanton,

Message:
PTAL

Description:
Reland parts of 'Use weak cells in map checks in polymorphic ICs'

This relands macroassembler instructions and weak cell caching and
does not include parts that caused "Linux ASan LSan" test failures.

BUG=v8:3663
LOG=N

Please review this at https://codereview.chromium.org/764003003/

Base URL: https://chromium.googlesource.com/v8/v8.git@master

Affected files (+353, -15 lines):
  M src/arm/macro-assembler-arm.h
  M src/arm/macro-assembler-arm.cc
  M src/arm64/lithium-codegen-arm64.cc
  M src/arm64/macro-assembler-arm64.h
  M src/arm64/macro-assembler-arm64.cc
  M src/factory.cc
  M src/ia32/macro-assembler-ia32.h
  M src/ia32/macro-assembler-ia32.cc
  M src/mips/macro-assembler-mips.h
  M src/mips/macro-assembler-mips.cc
  M src/mips64/macro-assembler-mips64.h
  M src/mips64/macro-assembler-mips64.cc
  M src/objects.h
  M src/objects.cc
  M src/objects-inl.h
  M src/objects-printer.cc
  M src/x64/macro-assembler-x64.h
  M src/x64/macro-assembler-x64.cc
  M src/x87/macro-assembler-x87.h
  M src/x87/macro-assembler-x87.cc
  M test/cctest/cctest.status
  M test/cctest/test-heap.cc
  M test/mjsunit/opt-elements-kind.js


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